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Editorial Team
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Asked: 2026-05-27T02:23:49+00:00

I declare an array of structs and want to declare a second into which

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I declare an array of structs and want to declare a second into which I can make a copy in order to re-initialze the structure at the start of each unit test.

So, I declare in 2 header files 

extern peripheralsArray_t Peripherals;  
extern peripheralsArray_t DefaultPeripherals;

and in 2 c files

peripheralsArray_t Peripherals =
{... init  values };
peripheralsArray_t DefaultPeripherals;

BUT, when I try to assign DefaultPeripherals = Peripherals; the GCC comiler (under Cygwin) says 

error: incompatible types when assigning 
       to type ‘peripheralsArray_t’ from type ‘struct _peripherals *’

Why does it think that Peripherals is a pointer?

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1 Answer

  1. Editorial Team

    Assuming that your type names are descriptive and peripheralsArray_t really is an array.

    C does not support array assignment, which is what you are trying to do.

    So the compiler see a array in a RHS context and deduces that it should decay to a pointer, which then has the wrong type.

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